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  1. or download this
    sub foo {
      alias $_[0] => my $byRef;
      ...
      $byRef += $result;
    }
    
  2. or download this
    use strict;
    use warnings;
    ...
    }
    
    foo();
    
  3. or download this
     1 = 1
     foo(): 1 = 99
    
  4. or download this
     1 = 1
     foo(): 1 = 1
    
  5. or download this
    This is perl, v5.8.0 built for MSWin32-x86-multi-thread
    (with 1 registered patch, see perl -V for more detail)
    ...
    
    Binary build 805 provided by ActiveState Corp. http://www.ActiveState.
    +com
    Built 18:08:02 Feb  4 2003
    
  6. or download this
    sub foo {
      alias $byRef => $_[0];
      ...